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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 04, 2020 | Mar. 30, 2019
Stock-based compensation costs |  |
Stock based compensation costs | $ 15,313 | $ 12,584
Income tax benefit | 1,366 | 3,320
Share based compensation costs after tax | 13,947 | 9,264
Total unrecognized compensation costs related to awards | $ 98,400 |
Weighted-average period of recognition of unrecognized compensation costs | 2 years 4 months 24 days |
Cost of revenues |  |
Stock-based compensation costs |  |
Stock based compensation costs | $ 335 | 318
Research and development |  |
Stock-based compensation costs |  |
Stock based compensation costs | 7,370 | 6,097
Selling, general and administrative |  |
Stock-based compensation costs |  |
Stock based compensation costs | $ 7,608 | $ 6,169

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